Installing Unpublished Add-ons

When you publish an add-on, users can install it through Gmail or the
G Suite Marketplace. Before publication, however, it is useful to test add-ons
that you develop within Gmail.

This page describes how to install an add-on that is currently under
development (called an unpublished or developer add-on) for testing or
personal use.

Requirements

The account you use to install an unpublished add-on must have read access
to that add-on's script project.

Before installing an unpublished add-on, you must have the ID of a valid
deployment. You can install a head
deployment that is always synced to the current code, a versioned deployment
that is locked to a specific version, or both. Once you have chosen which
deployment to use, you must
look up its deployment ID.

It is possible to install more than one deployment of the same add-on,
provided you have the deployment IDs for each. You can also install
an unpublished add-on created by another developer, provided you have the
deployment ID and permission to access the associated script project. Users
in a G Suite organization can only install and run unpublished add-ons authored
by users in the same organization.

Install an unpublished add-on

You can install an unpublished add-on's deployment with the following steps: